Overclocking the Sapphire X1900GT
Since the X1900 GT is based on the same core as the XT and XTX models, we knew there would be plenty of headroom for overclocking, and we weren't overly disappointed. Our final overclocking results came out to be 635MHz for the core, and 665MHz for the memory. These increases were 60MHz and 70MHz, respectively, over their default speeds. For the GPU, at least, we're now placed firmly between the X1900 XT and XTX speeds, which is a welcome bonus.
While the overclocked speeds sounded pretty decent, the returns were only modest. The overall 3DMark06 score jumped up 178 points, about a 4 percent increase. We also managed to gain an extra two frames per second while benchmarking F.E.A.R. at the most demanding settings - 1600x1200 with 4xAA and 8xAniso. Both tests fell well shy of the greater than 10% overclock on the core that we had achieved, however.